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Yes, 2012 335 and my 2011 X3 both have sensors inside. they go off when we leave the windows open and someone tries to reach for something inside, as soon as you put the hand inside, of course, the key can not be around at all! It has to be far away... I've only been able to make the alarm go off, and it was an accident lol... but that's how i found out..
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